Tongue-switch.



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emuafi ATTORNEY.

No. 765,662. PATENTED JULY 26, 1904.

G.M.ERVIN.

TONGUE SWITCH. APPLIOATION FILED APB-2, 1003. N0 IODBL.

Dllll Erna PATENTED JULY 26, 1904.

G. M. ERVIN. TONGUE SWITCH. APPLICATION FILED APR. 2, 1903.

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WITNESSES: P mgmm L UNITED STATES Patented July 26, 1904.

PATENT OFFICE.

GEORGE M. ERVIN, OF JOHNSTO'WN, PENNSYLVANIA, ASSIGNOR TO THE LORAINSTEEL COMPANY, A CORPORATION OF PENNSYLVANIA.

TONGUE-SWITCH.

SPECIFICATION forming part of Letters Patent N0. 765,662, dated July 26,1904.

Application filed April 2, 1903. Serial No. 150,740. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE M. ERVIN, of J ohnstown, in the county ofOambria and State of Pennsylvania, have invented a new and usefulImprovement in Tongue Switches, of which the following is a full, clear,and exact description, reference being had to the accompanying drawings,which form a part of this specification.

My invention has relation to certain new and useful improvements intongue-switches, and is designed to provide an improved bearing for theheel portion of the movable tongue and for its pin or pivot.

In the operation of switches of this type considerable trouble has beenexperienced by reason of the tendency of the heel portion of the tongueto grind or cut away its bearing on the bed of the structure. This oftenoccurs to such an extent as to seriously impair the operation andusefulness of the structure and to make necessary more or less frequentrenewals. Various means have been devised to overcome this defect, mostof them having in view the provision of a bearing-surface of a very hardand durable character. These, however, have not been altogethersatisfactory, owing to the difliculty in securing the bearing-surfacefirmly in the bed of the structure and also by reason of the fact thatthe material used is of such hard nature as to make it very difiicult toform therein a proper bearing for the tongue pin or pivot.

The present invention also seeks to provide a harder and more durablebearing-surface; and it consists in the novel construction, arrangement,and combination of parts, all substantially as hereinafter described andclaimed, whereby the bearing-piece is securely held in place and thedifliculty in providing aproper pin-bearing is overcome.

Referring to the accompanying drawings, Figure 1 is a plan view of atongue-switch embodying my invention with the tongue removed. Fig. 2 isan enlarged plan View of the heel portion of the structure; Fig. 3, asection on the line 8 3 of Fig. 2 with the tongue in place; Fig. 4, asection on the line 4 L of Fig. 2; Figs. 1 and 2, views similar to Fig.2, but showing modified constructions; and Fig. 3 a section on the line3 3 of Fig. 1

The letter A designates the body portion of the structure, which in theconstruction shown in Figs. 1, 2, 3, and 4: is an integral castinghaving a pocket or seat A for the tongue B.

C is a hard-metal wear-plate of any suitable material, such as manganesesteel, and which is seated in the body A to form a bearing for the heelportion of the tongue B, as clearly shown in Fig. 3. This piece O isformed with the upward extension 0 behind the convex end of the heel ofthe tongue, its concave bearingface for said end being cast toapproximately the right shape and then finished with an emery-wheel orother suitable grinding-tool.

'It is also formed with a downward extension 0', which preferablyextends through to the bottom of the structure and in which is formedthe bearing for the tongue pin or pivot b. This bearing is formed by asleeve D, of steel or iron, which is placed in the mold in casting thepiece O and the metal thereof cast about it, being held therein by theshrinkage of the metal around it. This sleeve being of ordinary iron orsteel can be readily boredout and gilled to form an accurate bearing forthe pm In assembling the structure the piece C is seated loosely in thebody A and after being properly leveled up is secured in place by keysor wedges E, driven between it and the body of the structure. These keysor wedges are preferably of the divided type described and claimed in myPatent No. 7 29,049, dated May 26, 1908, so that they can be readilyreleased by driving thereon. Molten spelter (shown at F) or othersimilar material is then poured around and underneath said piece to bedit and further secure it.

G designates a holding-down device for the tongue. This device may be ofany suitable character and forms no part of my present invention.

Figs. 1 and 3 show the invention applied to a built-up T-rail structure.In this construction the piece C is shaped to fit under the head of theT-rails H. In making this construction the rails H and the piece G areset in the proper relation to each other in a suitable mold and the bedor filler I, of cast iron, is cast in place, the piece being held by themetal cast around it. Cores are formed in said bed, through which thetrough-bolts I are afterward inserted. In this construction the upwardextension 0 of the piece C is usually omitted. Fig. 2 also shows abuilt-up T-rail structure, in which the piece 0 instead of being cast inplace, as in Figs. 1 and 3 is secured by keys or wedges and by a beddingor retaining material, as in Figs. 1, 2, 3, and 4. The key-seats areshown at K. In this construction, as well as thatshown in Figs. 1, 2, 3,and 4, the piece C is removable and renewable.

I do not'wish to limit myself to the precise constructions andarrangements of parts herein shown and described, as various changes maybe made in the details thereof without departing from the spirit andscope ofmy invention as it is defined in and by the following claims.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a tongue-switch, a hard-metal bed bearing-piece having therein asleeve of relatively softer metal about which the piece is cast andwhich forms a bearing for the tongue pin or pivot.

2. In a tongue-switch, a hard-metal bed bearing-piece secured in thebody of the structure and'formed with a downward extension in which isseated a bearing-sleeve of relatively softer material about which thesaid piece is cast.

3. In a tongue-switch, a hard-metal bed bearing-piece secured in thebody of the structure and formed with a downwardly-extended bearing forthe tongue-pin.

4. In a tongue-switch, a hard-metal bearing-piece secured in the body ofthe structure and formed with a downwardly-extended bearing for thetongue-pin, and with an upwardlyextended bearing for the heel end of thetongue.

5. In a tongue-switch, the combination with the body portion of thestructure, of the hardmetal plate removably seated and secured therein,and a bearing-sleeve of relatively softer metal in said piece and aboutwhich it is cast.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

GEO. ERVIN.

Witnesses:

LORETTO OGONNELL, H. W. SMITH.

